Fans of the defending Super Bowl-champion Seattle Seahawks support the NFL’s very best team, but for the moment the 12th Man ranks second as a fanbase — at least in terms of noise-making. Kansas City …

Updated 7:45 p.m., Sept. 15: The 12th Man did it! Here’s our story on Seahawks fans setting a new world record for loudest crowd roar. When the Seahawks and 49ers take the field Sunday in Seattle, the …